In terms of precipitation, rainfall in Islip, New York ranges from 3.3 - 4.4 inches per month. March is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Islip, New York when rainfall is around 3.3 in.

If weather is an important factor for your trip to Islip, New York, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

How far in advance should I book a flight from Knoxville to Islip, New York?

Find a great deal and save up to 88% by booking at least 29 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Knoxville to Islip, New York within the next two weeks, with the cheapest ticket starting at $237.

What is the cheapest month to fly from Knoxville to Islip, New York?

April can be a great time to fly to Islip, New York from Knoxville with a flight ticket averaging about $264. Cheapflights users have found deals in the month of April for as cheap as $55. The most expensive prices can be found in the month of March.

What is the cheapest time of day to fly from TYS to ISP?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Knoxville to Islip, New York as you normally would.

Can I find deals for flights from Knoxville to Islip that include hotel bookings?

Yes. In addition to deals on Knoxville to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Knoxville to Islip?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Knoxville to Islip.

Can I find deals for business class flights from Knoxville to Islip?

Yes. Cheapflights offers flight deals from Knoxville to Islip by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$325+ Flights from Knoxville to Islip, NY

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Cheap flight deals from Knoxville to Islip

Round-trip from	$699 (Mytrip)
One-way from	$325 (Mytrip)
Popular in	March
Cheapest in	April
Average price	$280

From Knoxville McGhee Tyson to Islip Long Island

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One-way flight from Knoxville McGhee Tyson to Islip Long Island

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High demand for flights, 3% potential price rise

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Cheapest flight prices on average. 0% potential price decrease ($2 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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Cheapest flights from Knoxville to Islip
Explore the most affordable flight options available from Knoxville to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Tue 8/127:00 amTYS - ISP

1 stop6h 24mMultiple Airlines

Tue 8/197:30 amISP - TYS

1 stop5h 02mMultiple Airlines

Deal found 7/27

$699

Best flights from Knoxville to Islip
Discover carefully curated flight deals from Knoxville to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2025.

Tue 8/127:00 amTYS - ISP

1 stop6h 24mMultiple Airlines

Tue 8/197:30 amISP - TYS

1 stop5h 02mMultiple Airlines

Deal found 7/27

$699

Last-minute flights from Knoxville to Islip
Discover last-minute flight deals from Knoxville to Islip. Data last updated July 29, 2025 and is based on user searches.

Tue 8/127:00 amTYS - ISP

1 stop6h 24mMultiple Airlines

Tue 8/197:30 amISP - TYS

1 stop5h 02mMultiple Airlines

Deal found 7/27

$699

One-way flights from Knoxville to Islip
Search for one-way flight options from Knoxville to Islip. Find affordable one-way fares based on user searches. Data last updated July 29, 2025.

Sun 8/37:10 amTYS - ISP

2 stops11h 49mMultiple Airlines

Deal found 7/27

$325

Fly from

Fly to

Route

Depart

Return

Price

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Tue 8/12

7:00 am-1:24 pm

1 stop6h 24m

Islip Long Island

Tue 8/19

7:30 am-12:32 pm

1 stop5h 02m

$699

KnoxvilleIslip

TYS - ISP

TYSISP

Knoxville McGhee Tyson

Sun 8/3

7:10 am-6:59 pm

2 stops11h 49m

$325

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Best time to book a flight from Knoxville to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Knoxville with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Knoxville to Islip

What is the cheapest month to book a flight from Knoxville to Islip, New York?

Currently, January is the cheapest month in which you can book a flight from Knoxville to Islip, New York (average of $108). Flying from Knoxville to Islip, New York in November is currently the most expensive (average of $213). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Can I find deals for flights from Knoxville to Islip that include hotel bookings?
Yes. In addition to deals on Knoxville to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Knoxville to Islip?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Knoxville to Islip.
Can I find deals for business class flights from Knoxville to Islip?
Yes. Cheapflights offers flight deals from Knoxville to Islip by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Knoxville to Islip, New York?
Currently, January is the cheapest month in which you can book a flight from Knoxville to Islip, New York (average of $108). Flying from Knoxville to Islip, New York in November is currently the most expensive (average of $213). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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$325+ Cheap flights from Knoxville to Islip, NY (TYS - ISP)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/3. Fares are subject to change and may not be available on all flights or dates of travel.

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Find flight deals from Knoxville to Islip

Cheapest flights from Knoxville to IslipExplore the most affordable flight options available from Knoxville to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Explore the most affordable flight options available from Knoxville to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

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Use the filters below to find and compare flights from Knoxville to Islip that are best for you.

Best time to book a flight from Knoxville to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Knoxville with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Knoxville to Islip

What is the cheapest month to book a flight from Knoxville to Islip, New York?

Related info for your journey

Find useful and relevant information for your journey from Knoxville to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

Can I find deals for flights from Knoxville to Islip that include hotel bookings?

How can I find direct flights from Knoxville to Islip?

Can I find deals for business class flights from Knoxville to Islip?

What is the cheapest month to book a flight from Knoxville to Islip, New York?

Traveling to a place near Islip?

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Cheapest flights from Knoxville to Islip
Explore the most affordable flight options available from Knoxville to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.